CZ P-09 Suppressor Night Sights

[Hutehund]

I bought a suppressor ready Black P-09 yesterday which has the threaded barrel, but lacks the nice high Tritium night sights that come on the Urban Grey Model.  What a sweet pistol - I really like it. 


Anyway... I'd went to order the CZ suppressor sights, but it looks like there are three different heights, #'s 2, 3, and 4.  The gun will host a Rugged Obsidian 45 can, and I wonder if anyone knows which of these might be best?  Short of that, does anyone know which height comes standard on the Urban Grey?


Thanks in advance for any help you can offer.

[Bam]

Your current front sight will have the number stamped on it. Mine is a 3